. >> david, white house spokesman jay carney asked yesterday if president obama knew about any potential v.p. swaps, listen to this -- >> you're saying he was aware of this or was not -- >> i think if you ask the people who were more directly running the campaign that question, they might have an answer. i'm not aware that he was aware of it. >> in those conversations about kicking biden off the ticket here, is it possible the president may not have been aware of those discussions happening around him? >> i think chris is right in what she said. i covered the campaign. there were moments where the president seemed to have losst some of the momentum he had four years ago. hillary clinton was riding high in the polls as secretary of state. there was public talk among pundits and so on. i'm sure the campaign were thinking about every potential option. whether it reached the level of president obama or was serious, it looks unlikely. david plouffe is adamant about that. i think this is a lot of talk. biden's role in this white house has been periodically questioned about how serious a conten